肾素-血管紧张素系统活动加强时,下列哪项正确()。
A.醛固酮释放减少
B.静脉回心血量减少
C.肾脏排钠量减少
D.体循环平均充盈压减低
E.交感神经末梢释放递质减少
参考答案:C
— You wear a sad look on your face. What's wrong, Linda?
— Oh, nothing much. I _____ of my friends back home actually. [ ]
A. just thought
B. have just been thinking
C. was just thinking
D. have just thought
如何计算连消的物料体积、流量、加热时间和维持时间?